The “Gates Carbon Drive™" mobile app is used to measure the belt tension sonically using
the belt vibration frequency (Hz). Pluck the belt like a guitar string to create the belt vibration
sound wave and a smart phone running the “Gates Carbon Drive™" app to measure the
sound wave and compute the resultant belt tension vibration frequency (in Hz), see Gates®
Carbon Drive Mobile™ App.
Specialized Tools
• Smart Phone (iOS or Android) • Gates Carbon Drive™ Mobile App
• Smart phone external mic (recommend
Lavalier lapel smart phone mic)
Specifications
System Component Specification
Drive Belt Cal Distance 1-1/16"
Step-up Belt Tension 230 Hz +/-10
Step-up Pulley Shaft Nuts 480 in-lbs (40 ft-lbs, 54.2 Nm)
Idler Pulley Nut 120in-lbs (13.6 Nm)
Procedure
The Drive belt tension will be adjusted first by adjusting the position of the Drive pulley and
then the Step-up belt will be tensioned sonically in terms of belt vibration frequency (Hz)
using the “Gates Carbon Drive™" mobile app, see Gates® Carbon Drive Mobile™ App.
Review entire procedure before starting.
Belt Tension Verification check
If this not a belt or input drive system component replacement, do a drive belt and step-up
belt tension and alignment verification check prior to doing a belt adjustment procedure. If
Contact Precor Customer Support at support@precor.com or 800.786.8404 with
any questions.
Page 49
5 Adjustment Procedures
Input Drive and Step-up Belt Tension Adjustment
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